database normalisation - ορισμός. Τι είναι το database normalisation
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Τι (ποιος) είναι database normalisation - ορισμός

REDUCTION OF DATA REDUNDANCY
Database normalisation; Normal forms; Canonical synthesis; Database Normalization; Database normal form; Normalization (database); Relational Database Normalization; Database Normalisation; Data anomaly; Insertion anomaly; Insert anomaly; Update anomaly; Delete anomaly; Deletion anomaly; Normalised data; Data normalisation; Normal form (databases); Relational schema normalization; Normalized data
  • A '''deletion anomaly'''. All information about Dr. Giddens is lost if they temporarily cease to be assigned to any courses.
  • An '''insertion anomaly'''. Until the new faculty member, Dr. Newsome, is assigned to teach at least one course, their details cannot be recorded.
  • An '''update anomaly'''. Employee 519 is shown as having different addresses on different records.

database normalisation         
<database> A series of steps followed to obtain a database design that allows for efficient access and storage of data in a relational database. These steps reduce data redundancy and the chances of data becoming inconsistent. A table in a relational database is said to be in normal form if it satisfies certain constraints. Codd's original work defined three such forms but there are now five generally accepted steps of normalisation. The output of the first step is called First Normal Form (1NF), the output of the second step is Second Normal Form (2NF), etc. First Normal Form eliminates repeating groups by putting each value of a multi-valued attribute into a new row. Second Normal Form eliminates functional dependencies on a partial key by putting the fields in a separate table from those that are dependent on the whole key. Third Normal Form eliminates functional dependencies on non-key fields by putting them in a separate table. At this stage, all non-key fields are dependent on the key, the whole key and nothing but the key. Fourth Normal Form separates independent multi-valued facts stored in one table into separate tables. Fifth Normal Form breaks out data redundancy that is not covered by any of the previous normal forms. http://bkent.net/Doc/simple5.htm. [What about non-relational databases?] (2005-07-28)
Database normalization         
Database normalization is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity. It was first proposed by Edgar F.
database         
  • Basic structure of navigational [[CODASYL]] database model
  • Collage of five types of database models
  • thumb
  • In the [[relational model]], records are "linked" using virtual keys not stored in the database but defined as needed between the data contained in the records.
ORGANIZED COLLECTION OF DATA IN COMPUTING
Database management system; DBMS; Database/Applications; Database system; List of database servers; List of Database Servers; Data base; Database software; Databases; Distributed data base; Database language; Dbms; Database Management System; Database management systems; Database systems; Data Base; Database instance; Distributed database management system; DDBMS; Distributed Database Management System; Data base management system; Database manager; Computer database; Database programming; Database development; Replication transparency; Forensic database; Db management; Database Management; Data bases; Database management software; Database System; Relation-valued attribute; Information Principle; Database Manager; Query Processing; Database query; Public database; D-base; DBMSs; Enterprise database management; Database management program; Database information system; Database management; Computer Databases; DB file; Types of DBMS; Database queries; Data-base; Scientific database; Research database; Numeric database; General-purpose DBMS; Distributed databases; DataBase; Database backend; Electronic data processing database; Public databases; History of database systems; Static analysis of query languages; Database (computing); Database languages
also data base (databases)
A database is a collection of data that is stored in a computer and that can easily be used and added to.
They maintain a database of hotels that cater for businesswomen.
N-COUNT

Βικιπαίδεια

Database normalization

Database normalization or database normalisation (see spelling differences) is the process of structuring a relational database in accordance with a series of so-called normal forms in order to reduce data redundancy and improve data integrity. It was first proposed by British computer scientist Edgar F. Codd as part of his relational model.

Normalization entails organizing the columns (attributes) and tables (relations) of a database to ensure that their dependencies are properly enforced by database integrity constraints. It is accomplished by applying some formal rules either by a process of synthesis (creating a new database design) or decomposition (improving an existing database design).